fb: JZ4770: Cut the rightmost column of pixels to avoid showing garbage

If we are upscaling horizontally, the last columns of pixels
shall be hidden, as they usually contain garbage: the last
resizing coefficients, when applied to the last column of the
input frame, instruct the IPU to blend the pixels with the
ones that correspond to the next column, that is to say the
leftmost column of pixels of the input frame.